Passmark is a synthetic based score. It means this is what your CPU/GPU is capable of but it doesn't mean it will translate to the real world.
Thats mainly because programs like Passmark are usually programmed to take advantage of all the advanced features, cores and power of a part while the real world software is not.
Its nice to know where you stand but in all honesty, the best way to see performance of a CPU/GPU and such is via real world tests like games, commonly used software (WinRAR, encoders etc).
NOW that makes sense...so how do you know what to upgrade to?
i have a t4400 in a l505 laptop, and i want to upgrade to another compatible socket p cpu...in its self is difficult to know, nevermind the true benchmark score.
i think anandtech has a better benchmark test...but it does not have ALL the cpus to compare...